Accessibility

An accessibility audit runs against the built site as part of certification and fails the build rather than reporting to nobody. It checks heading order, landmarks, skip links, table captions and headers, image alternatives, form labels, focus visibility, and that reduced-motion and dark-theme rules are present. A page that breaks any of them does not ship.

A chart is a picture of numbers, and a picture is no use to a screen reader. Where Hydrionis draws a series it also publishes the values — most visibly on the reservoir pages, where a century of monthly storage sits in a real table beneath the chart.

Maps are the honest gap. A point map showing where gauges sit conveys something a table does not, and the table beside it is a list of names and coordinates rather than an equal alternative. Long data tables are also long: they are navigable by screen reader and genuinely tedious, and pagination would trade one accessibility problem for another.

Colour is never the only carrier of meaning, but the palette has not been tested with people who have low vision on real hardware — only against contrast thresholds. That is a weaker claim than a tested one and is stated as such.

If something here is unusable, that is a defect and worth reporting: hello@hekno.co.uk. Please say which page and what you were using — it is far more useful than a general report, and it is the only way the gaps above get closed.

This statement was last reviewed on 2026-08-25.